fix: type errors

Author: ota-meshi

src/parser/extend-parser.ts

@@ -23,7 +23,6 @@ export function getParser(): typeof Parser {
   }
 
   parserCache = class ExtendParser
-    // @ts-expect-error -- Ignore
     extends getAcorn().Parser
   {
     private [PRIVATE]: {
@@ -180,7 +179,6 @@ export function getParser(): typeof Parser {
 /** Get extend parser */
 export function getAnyTokenErrorParser(): typeof Parser {
   const parser = class ExtendParser
-    // @ts-expect-error -- Ignore
     extends getParser()
   {
     public constructor(options: Options, code: string, pos: number) {

src/parser/validate.ts

@@ -506,6 +506,9 @@ function validateBinaryExpressionNode(
   ) {
     throw throwOperatorError();
   }
+  if(left.type === 'PrivateIdentifier') {
+    throw throwUnexpectedNodeError(left, tokens);
+  }
   validateExpr(left, throwOperatorError);
   validateExpr(right, () => throwUnexpectedNodeError(right, tokens));